Energy storage confluence cabinet and energy storage system

Abstract

The utility model provides an energy storage confluence cabinet and an energy storage system, and the energy storage confluence cabinet comprises a cabinet body; the primary side loop is arranged in the cabinet body, the first end of the primary side loop is connected with the charging and discharging end of the battery, and the second end of the primary side loop is connected with the direct current end of the energy storage converter; and the detection device comprises a direct current voltmeter, the detection end of the direct current voltmeter is connected with the second end of the primary side loop, and the direct current voltmeter is arranged on the outer surface of the cabinet body. In the energy storage confluence cabinet and the energy storage system disclosed by the invention, the direct current voltmeter can read the voltage of the primary side loop and visually display the voltage on the outer surface of the cabinet body, so that the operation of frequently opening the cabinet body by an operator due to voltage detection is omitted, the efficiency of monitoring the voltage of the primary side loop is effectively improved, and the cost is reduced. And the electric shock risk of operators is reduced, so that the safety of primary side loop voltage monitoring is effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage technology, and in particular to an energy storage combiner cabinet and an energy storage system. Background Art

[0002] The combiner cabinet is used for the combiner control of the energy storage system. It is one of the most important facilities in the energy storage system. The current combiner cabinet can only monitor the status of the secondary side circuit. The voltage of the high-voltage primary side circuit cannot be obtained directly. It is necessary to open the combiner cabinet and use tools such as multimeters to measure. This method is not only inconvenient to operate and has low monitoring efficiency, but also increases the risk of electric shock for operators and has low safety. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an object of the present disclosure is to provide an energy storage combiner cabinet and an energy storage system.

[0005] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides an energy storage combiner cabinet, comprising: a cabinet body; a primary side circuit, wherein the primary side circuit is arranged in the cabinet body, and the first end of the primary side circuit is connected to the charging and discharging end of the battery, and the second end of the primary side circuit is connected to the DC end of the energy storage converter; a detection device, wherein the detection device comprises: a DC voltmeter, the detection end of the DC voltmeter is connected to the second end of the primary side circuit, and the DC voltmeter is arranged on the outer surface of the cabinet body.

[0006] Optionally, the detection device also includes: a voltage-dividing resistor, which is connected in series between the detection end of the DC voltmeter and the second end of the primary side loop, and the first end of the voltage-dividing resistor is connected to the positive pole of the second end of the primary side loop, and the second end of the voltage-dividing resistor is connected to the positive pole of the detection end of the DC voltmeter.

[0007] Optionally, the detection device also includes: a fuse, which is connected in series between the detection end of the DC voltmeter and the second end of the primary side loop, and the first end of the fuse is connected to the positive pole of the second end of the primary side loop, and the second end of the fuse is connected to the positive pole of the detection end of the DC voltmeter.

[0008] Optionally, the DC voltmeter is arranged on the outer surface of the cabinet door of the cabinet.

[0009] Optionally, the energy storage junction cabinet further includes: a locking device, the locking device including: an electromagnetic lock, the power supply end of the electromagnetic lock is connected to the second end of the primary side circuit, and the electromagnetic lock is arranged on the cabinet door of the cabinet body, and the electromagnetic lock is used to lock the cabinet door when power is supplied.

[0010] Optionally, the locking device also includes: a switching power supply, which is connected in series between the power supply end of the electromagnetic lock and the second end of the primary side loop, and the power supply end of the switching power supply is connected to the second end of the primary side loop, and the power supply end of the switching power supply is connected to the power supply end of the electromagnetic lock.

[0011] Optionally, the electromagnetic lock is provided with an emergency unlocking hole, and the emergency unlocking hole is used to insert an unlocking key so that the cabinet door is released when the electromagnetic lock is energized.

[0012] Optionally, the primary side circuit includes: a load switch, a first end of the load switch is connected to the charging and discharging end of the battery, and a second end of the load switch is connected to the DC end of the energy storage inverter; wherein the detection end of the DC voltmeter is connected to the second end of the load switch.

[0013] Optionally, the primary side circuit further includes: an insulating plate, and the insulating plate is arranged at the first end and / or the second end of the load switch.

[0014] A second aspect of the present disclosure provides an energy storage system, comprising: a battery, an energy storage inverter and an energy storage combiner cabinet as provided in the first aspect of the present disclosure; wherein a first end of a primary side loop of the energy storage combiner cabinet is connected to a charging and discharging end of the battery, and a second end of the primary side loop is connected to a DC end of the energy storage inverter, and an AC end of the energy storage inverter is connected to a charging and discharging end of a load.

[0015] The technical solution provided by the present disclosure may have the following beneficial effects:

[0016] Since the first end of the primary side loop is connected to the charging and discharging end of the battery, and the second end of the primary side loop is connected to the DC end of the energy storage inverter, the primary side loop can realize the convergence transmission and control of electric energy between the charging and discharging end of the battery and the DC end of the energy storage inverter, thereby meeting the energy storage demand of the energy storage system; at the same time, since the detection end of the DC voltmeter is connected to the second end of the primary side loop, and the DC voltmeter is arranged on the outer surface of the cabinet, the DC voltmeter can read the voltage of the primary side loop and intuitively display it on the outer surface of the cabinet, thereby eliminating the need for operators to frequently open the cabinet for voltage detection, thereby effectively improving the efficiency of primary side loop voltage monitoring, and also reducing the risk of electric shock for operators, thereby effectively improving the safety of primary side loop voltage monitoring.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a circuit diagram of an energy storage system proposed in one embodiment of the present disclosure;

[0020] Figure 2 is a structural schematic diagram of an energy storage combiner cabinet proposed in an embodiment of the present disclosure;

[0021] Figure 3 is a circuit diagram of a detection device in an energy storage combiner cabinet proposed in an embodiment of the present disclosure;

[0022] Figure 4 is a circuit diagram of a locking device in an energy storage combiner cabinet proposed in an embodiment of the present disclosure;

[0023] As shown in the figure: 1. Energy storage combiner cabinet;

[0024] 11, cabinet body, 111, cabinet door;

[0025] 12. Primary circuit, 121. Load switch;

[0026] 13. Detection device, 131. DC voltmeter, 132. Voltage dividing resistor, 133. Fuse;

[0027] 14. Locking device, 141. Electromagnetic lock, 142. Switching power supply;

[0028] 2. Battery, 3. Energy storage inverter, 4. Load. DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and should not be construed as limitations on the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, the embodiment of the present disclosure proposes an energy storage combiner cabinet 1, comprising: a cabinet body 11, a primary side loop 12 and a detection device 13, the primary side loop 12 is arranged in the cabinet body 11, and the first end of the primary side loop 12 is connected to the charging and discharging end of the battery 2, and the second end of the primary side loop 12 is connected to the DC end of the energy storage converter 3 (Power Conversion System, PCS), the detection device 13 comprises: a DC voltmeter 131, the detection end of the DC voltmeter 131 is connected to the second end of the primary side loop 12, and the DC voltmeter 131 is arranged on the outer surface of the cabinet body 11.

[0031] It can be understood that, since the first end of the primary side loop 12 is connected to the charging and discharging end of the battery 2, and the second end of the primary side loop 12 is connected to the DC end of the energy storage inverter 3, the primary side loop 12 can realize the convergence transmission and control of electric energy between the charging and discharging end of the battery 2 and the DC end of the energy storage inverter 3, thereby meeting the energy storage demand of the energy storage system; at the same time, since the detection end of the DC voltmeter 131 is connected to the second end of the primary side loop 12, and the DC voltmeter 131 is arranged on the outer surface of the cabinet 11, the DC voltmeter 131 can read the voltage of the primary side loop 12 and intuitively display it on the outer surface of the cabinet 11, thereby eliminating the need for operators to frequently open the cabinet 11 due to voltage detection, thereby effectively improving the efficiency of voltage monitoring of the primary side loop 12, and also reducing the risk of electric shock for operators, thereby effectively improving the safety of voltage monitoring of the primary side loop 12.

[0032] It should be noted that the cabinet 11 serves as the main structure of the energy storage junction cabinet 1, and it plays the role of carrying the primary side circuit 12, the detection device 13 and other devices. The specific type of the cabinet 11 can be set according to actual needs and is not limited to this. For example, the cabinet 11 is a cabinet-like structure close to a rectangular parallelepiped, and a accommodating chamber is arranged inside the cabinet 11, and the opening of the accommodating chamber faces the front side of the cabinet 11. A rotating cabinet door 111 is arranged on the cabinet 11, and the cabinet door 111 is used to cover the opening of the accommodating chamber.

[0033] The primary side loop 12 is used for the convergence transmission and control of electric energy between the charging and discharging ends of the battery 2 and the DC end of the energy storage converter 3. The specific type of the primary side loop 12 can be set according to actual needs and is not limited to this.

[0034] Among them, the battery 2 is used to store and release electrical energy, that is, charging and discharging. The battery 2 may include: a plurality of battery cells connected in series and / or in parallel. The specific type of the battery 2 can be set according to actual needs and is not limited to this.

[0035] The energy storage converter 3 is used to control the charging and discharging process of the battery 2 and perform AC-DC conversion. It has a DC terminal and an AC terminal. The specific type of the energy storage converter 3 can be set according to actual needs and is not limited. The AC terminal of the energy storage converter 3 can be connected to a load 4 such as a power grid.

[0036] The DC voltmeter 131 is used to detect the voltage at the second end of the primary side loop 12. In other words, the DC voltmeter 131 is used to detect the voltage at the DC end of the energy storage inverter 3. The voltage detected by the DC voltmeter 131 can be used to determine whether the DC end of the energy storage inverter 3 is energized and whether the DC voltage is normal. The specific type of the DC voltmeter 131 can be set according to actual needs and is not limited to this.

[0037] like Figure 3 As shown, in some embodiments, the detection device 13 also includes: a voltage-dividing resistor 132, which is connected in series between the detection end of the DC voltmeter 131 and the second end of the primary side loop 12, and the first end of the voltage-dividing resistor 132 is connected to the positive pole of the second end of the primary side loop 12, and the second end of the voltage-dividing resistor 132 is connected to the positive pole of the detection end of the DC voltmeter 131.

[0038] It can be understood that since the first end of the voltage-dividing resistor 132 is connected to the positive pole of the second end of the primary side loop 12, and the second end of the voltage-dividing resistor 132 is connected to the positive pole of the detection end of the DC voltmeter 131, the voltage-dividing resistor 132 can play a role in voltage division and current limiting for the DC voltmeter 131, so that the DC voltmeter 131 can use the voltage-dividing resistor 132 to achieve a larger range of detection, thereby meeting the high voltage monitoring requirements of the primary side loop 12.

[0039] It should be noted that the voltage-dividing resistor 132 is used to utilize voltage division and current limiting to increase the range of the DC voltmeter 131 , and can also protect the DC voltmeter 131 . The specific type of the voltage-dividing resistor 132 can be set according to actual needs and is not limited to this.

[0040] like Figure 3 As shown, in some embodiments, the detection device 13 also includes: a fuse 133, which is connected in series between the detection end of the DC voltmeter 131 and the second end of the primary side loop 12, and the first end of the fuse 133 is connected to the positive pole of the second end of the primary side loop 12, and the second end of the fuse 133 is connected to the positive pole of the detection end of the DC voltmeter 131.

[0041] It can be understood that since the first end of the fuse 133 is connected to the positive pole of the second end of the primary side loop 12, and the second end of the fuse 133 is connected to the positive pole of the detection end of the DC voltmeter 131, the fuse 133 can play an overcurrent protection role for the DC voltmeter 131, thereby ensuring that the DC voltmeter 131 can stably and accurately detect the voltage of the primary side loop 12.

[0042] It should be noted that the fuse 133 is used for overcurrent protection of the DC voltmeter 131 , and the specific type of the fuse 133 can be set according to actual needs and is not limited thereto.

[0043] like Figure 2 As shown, in some embodiments, the DC voltmeter 131 is disposed on the outer surface of the cabinet door 111 of the cabinet body 11 .

[0044] It is understandable that, since the DC voltmeter 131 is disposed on the outer surface of the cabinet door 111 of the cabinet body 11 , the DC voltmeter 131 can more intuitively display the primary side voltage to the operator, thereby making the energy storage combiner cabinet 1 convenient to use.

[0045] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the energy storage combiner cabinet 1 further includes: a locking device 14, the locking device 14 includes: an electromagnetic lock 141, the power supply end of the electromagnetic lock 141 is connected to the second end of the primary side circuit 12, and the electromagnetic lock 141 is arranged on the cabinet door 111 of the cabinet body 11, and the electromagnetic lock 141 is used to lock the cabinet door 111 when power is supplied.

[0046] It can be understood that since the power supply end of the electromagnetic lock 141 is connected to the second end of the primary side circuit 12, and the electromagnetic lock 141 is arranged on the cabinet door 111 of the cabinet body 11, when the primary side circuit 12 is normally powered, the electromagnetic lock 141 can be energized and lock the cabinet door 111, thereby avoiding the energized opening of the junction cabinet, and thus eliminating the possibility of live operation by the operating personnel from the source, thereby effectively reducing the risk of electric shock for the operating personnel and improving the safety of the junction cabinet operation.

[0047] It should be noted that the voltage level of the primary circuit 12 in the combiner cabinet reaches DC1500V, DC2000V, etc., which is far beyond the safety voltage for human body. Therefore, the energized locking of the cabinet door 111 by the electromagnetic lock 141 avoids the live operation of the operators and effectively improves the safety factor of the combiner cabinet.

[0048] When the electromagnetic lock 141 is powered, the cabinet door 111 is locked. The specific type of the electromagnetic lock 141 can be set according to actual needs and is not limited. The electromagnetic lock 141 has a coil, a lock core, a lock bolt, etc. When the primary circuit 12 is powered normally, the coil inside the electromagnetic lock 141 is powered, and the coil generates a magnetic field around it using the principle of electromagnetic induction, so that the lock core attracts the lock bolt, thereby locking the cabinet door 111 by using the locking bolt on the cabinet body 11.

[0049] Among them, when the primary side circuit 12 is supplying power normally, that is, the battery 2 is charging or discharging, the electromagnetic lock 141 is energized and the cabinet door 111 is locked and cannot be opened. When the primary side circuit 12 is normally powered off or abnormally powered off, the electromagnetic lock 141 loses power and the cabinet door 111 is released and can be opened, and the operating personnel can work safely in the junction cabinet.

[0050] like Figure 4 As shown, in some embodiments, the locking device 14 also includes: a switching power supply 142, which is connected in series between the power supply end of the electromagnetic lock 141 and the second end of the primary side loop 12, and the power supply end of the switching power supply 142 is connected to the second end of the primary side loop 12, and the power supply end of the switching power supply 142 is connected to the power supply end of the electromagnetic lock 141.

[0051] It can be understood that since the power supply end of the switching power supply 142 is connected to the second end of the primary side loop 12, and the power supply end of the switching power supply 142 is connected to the power supply end of the electromagnetic lock 141, the switching power supply 142 can convert the electric energy of the primary side loop 12 to power the electromagnetic lock 141, thereby ensuring that the electromagnetic lock 141 stably locks the cabinet door 111, and further ensuring the safe operation of the junction cabinet.

[0052] It should be noted that the switching power supply 142 is used for power conversion. The specific type of the switching power supply 142 can be set according to actual needs and is not limited to this. For example, the switching power supply 142 can convert the DC1500V at the second end of the primary side loop 12 into DC220V that can be used by the electromagnetic lock 141.

[0053] In some embodiments, the electromagnetic lock 141 is provided with an emergency unlocking hole, and the emergency unlocking hole is used to insert an unlocking key so that the cabinet door 111 is released when the electromagnetic lock 141 is powered.

[0054] It is understandable that, since the electromagnetic lock 141 is provided with an emergency unlocking hole, the unlocking key can utilize the emergency unlocking hole to open the electromagnetic lock 141 when the electromagnetic lock 141 is powered, thereby utilizing the emergency maintenance situation of the combiner cabinet.

[0055] It should be noted that the emergency unlocking hole is used to insert the unlocking key, and the specific linkage structure inside the electromagnetic lock 141 can be set according to actual needs and is not limited to this.

[0056] like Figure 1 As shown, in some embodiments, the primary side loop 12 includes: a load switch 121, a first end of the load switch 121 is connected to the charging and discharging end of the battery 2, and a second end of the load switch 121 is connected to the DC end of the energy storage converter 3. The detection end of the DC voltmeter 131 is connected to the second end of the load switch 121.

[0057] It can be understood that, since the first end of the load switch 121 is connected to the charging and discharging end of the battery 2, and the second end of the load switch 121 is connected to the DC end of the energy storage inverter 3, the load switch 121 can control the on and off of the path between the charging and discharging end of the battery 2 and the DC end of the energy storage inverter 3, thereby meeting the flexible energy storage demand; at the same time, since the detection end of the DC voltmeter 131 is connected to the second end of the load switch 121, the DC voltmeter 131 can detect and display the voltage of the load switch 121, thereby meeting the monitoring requirements of the junction box.

[0058] It should be noted that the load switch 121 is used to control the on / off of the path between the charging and discharging end of the battery 2 and the DC end of the energy storage converter 3. The specific type of the load switch 121 can be set according to actual needs and is not limited to this.

[0059] The power supply end of the electromagnetic lock 141 is also connected to the second end of the load switch 121 .

[0060] In some embodiments, the primary loop 12 further includes: an insulating plate, which is disposed at the first end and / or the second end of the load switch 121 .

[0061] It can be understood that since the insulating plate is arranged at the first end and / or the second end of the load switch 121, the first end and / or the second end of the load switch 121 can be insulated and protected by the insulating plate, thereby further improving the safety factor of the combiner cabinet operation.

[0062] It should be noted that the insulating plate is used for insulation protection of the connection side of the load switch 121, and the specific type of the insulating plate can be set according to actual needs and is not limited to this.

[0063] like Figure 1 As shown, the embodiment of the present disclosure further proposes an energy storage system, comprising: a battery 2, an energy storage converter 3 and an energy storage combiner cabinet 1 as in the embodiment of the present disclosure; wherein the first end of the primary side loop 12 of the energy storage combiner cabinet 1 is connected to the charging and discharging end of the battery 2, and the second end of the primary side loop 12 is connected to the DC end of the energy storage converter 3, and the AC end of the energy storage converter 3 is connected to the charging and discharging end of the load 4.

[0064] It can be understood that, since the first end of the primary side loop 12 is connected to the charging and discharging end of the battery 2, and the second end of the primary side loop 12 is connected to the DC end of the energy storage inverter 3, the primary side loop 12 can realize the convergence transmission and control of electric energy between the charging and discharging end of the battery 2 and the DC end of the energy storage inverter 3, thereby meeting the energy storage demand of the energy storage system; at the same time, since the detection end of the DC voltmeter 131 is connected to the second end of the primary side loop 12, and the DC voltmeter 131 is arranged on the outer surface of the cabinet 11, the DC voltmeter 131 can read the voltage of the primary side loop 12 and intuitively display it on the outer surface of the cabinet 11, thereby eliminating the need for operators to frequently open the cabinet 11 due to voltage detection, thereby effectively improving the efficiency of voltage monitoring of the primary side loop 12, and also reducing the risk of electric shock for operators, thereby effectively improving the safety of voltage monitoring of the primary side loop 12.

[0065] It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0066] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0068] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. An energy storage combiner cabinet, characterized in that: include: Cabinet; A primary side loop, wherein the primary side loop is arranged in the cabinet, and a first end of the primary side loop is connected to a charging and discharging end of a battery, and a second end of the primary side loop is connected to a DC end of an energy storage converter; The detection device comprises: a DC voltmeter, a detection end of the DC voltmeter is connected to the second end of the primary side loop, and the DC voltmeter is arranged on the outer surface of the cabinet.

2. The energy storage combiner cabinet according to claim 1, characterized in that: The detection device also includes: A voltage-dividing resistor is connected in series between the detection end of the DC voltmeter and the second end of the primary side loop, and the first end of the voltage-dividing resistor is connected to the positive electrode of the second end of the primary side loop, and the second end of the voltage-dividing resistor is connected to the positive electrode of the detection end of the DC voltmeter.

3. The energy storage combiner cabinet according to claim 1, characterized in that: The detection device also includes: A fuse is connected in series between the detection end of the DC voltmeter and the second end of the primary side loop, and the first end of the fuse is connected to the positive pole of the second end of the primary side loop, and the second end of the fuse is connected to the positive pole of the detection end of the DC voltmeter.

4. The energy storage combiner cabinet according to claim 1, characterized in that: The DC voltmeter is arranged on the outer surface of the cabinet door of the cabinet.

5. The energy storage combiner cabinet according to claim 1, characterized in that: The energy storage combiner cabinet also includes: The locking device comprises an electromagnetic lock, wherein the power supply end of the electromagnetic lock is connected to the second end of the primary side circuit, and the electromagnetic lock is arranged on the cabinet door of the cabinet body, and the electromagnetic lock is used to lock the cabinet door when powered.

6. The energy storage combiner cabinet according to claim 5, characterized in that: The locking device also includes: A switching power supply is connected in series between the power supply end of the electromagnetic lock and the second end of the primary side loop, and the power supply end of the switching power supply is connected to the second end of the primary side loop, and the power supply end of the switching power supply is connected to the power supply end of the electromagnetic lock.

7. The energy storage combiner cabinet according to claim 5, characterized in that: The electromagnetic lock is provided with an emergency unlocking hole, and the emergency unlocking hole is used to insert an unlocking key so that the cabinet door is released when the electromagnetic lock is energized.

8. The energy storage combiner cabinet according to any one of claims 1 to 7, characterized in that: The primary circuit comprises: A load switch, wherein a first end of the load switch is connected to a charging and discharging end of the battery, and a second end of the load switch is connected to a DC end of the energy storage converter; Wherein, the detection end of the DC voltmeter is connected to the second end of the load switch.

9. The energy storage combiner cabinet according to claim 8, characterized in that: The primary side circuit also includes: An insulating plate is arranged at the first end and / or the second end of the load switch.

10. An energy storage system, characterized in that: include: A battery, an energy storage converter and an energy storage combiner cabinet as described in any one of claims 1 to 9; Among them, the first end of the primary side loop of the energy storage combiner is connected to the charging and discharging end of the battery, and the second end of the primary side loop is connected to the DC end of the energy storage inverter, and the AC end of the energy storage inverter is connected to the charging and discharging end of the load.

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